K S Divyalakshmi
Articles written in Journal of Earth System Science
Volume 125 Issue 4 June 2016 pp 821-839
The region around Wadakkancheri, Trichur District, Kerala is known for microseismic activity, since1989. Studies, subsequent to 2nd December 1994 (M=4.3) earthquake, identified a south dippingactive fault (Desamangalam Fault) that may have influenced the course of Bharathapuzha River. Theongoing seismicity is concentrated on southeast of Wadakkancheri and the present study concentratedfurther south of Desamangalam Fault. The present study identifies the northwestern continuity of NW–SE trending Periyar lineament, which appears to have been segmented in the area. To identify the subtlelandform modifications induced by ongoing tectonic adjustments, we focused on morphometric analysis.The NW–SE trending lineaments appear to be controlling the sinuosity of smaller rivers in the area,and most of the elongated drainage basins follow the same trend. The anomalies shown in conventionalmorphometric parameters, used for defining basins, are also closely associated with the NW–SE trendingPeriyar lineament/s. A number of brittle faults that appear to have been moved are consistent withthe present stress regime and these are identified along the NW–SE trending lineaments. The currentseismic activities also coincide with the zone of these lineaments as well as at the southeastern endof Periyar lineament. These observations suggest that the NW–SE trending Periyar lineaments/faultsmay be responding to the present N–S trending compressional stress regime and reflected as the subtlereadjustments of the drainage configuration in the area.
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